The production of jets in polarized proton collisions at STAR is dominated by quark-gluon and gluon-gluon scattering processes. The dijet longitudinal double-spin asymmetry (A LL ) is sensitive to the helicity distributions and may be used to extract information about the gluon helicity contribution ∆g(x, Q 2 ) to the spin of the proton. Previous STAR jet measurements at √ s = 200 GeV show evidence of polarized gluons for gluon momentum fractions above 0.05. The measurement of dijet A LL at √ s

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... = 510 GeV will extend the current constraints on ∆g(x, Q 2 ) to lower gluon momentum fractions and allow for the reconstruction of the partonic kinematics at leading order. These proceedings present preliminary results from the dijet A LL measurement from ∼ 50pb −1 of ∼ 50% polarized proton data taken during the 2012 RHIC run.